In the short story The Chess Problem (later chapter 11 of The Big Four), Gilmour Wilson is a young American chess master, considered a second Capablanca. He challenged Dr Savaronoff to a match and died during the game itself. At the time, Gilmour, playing white, had been making the third move of the Ruy Lopez, his favourite opening which he always used. A white bishop was still clasped in his left hand when he died. The fact that the third move for white (B-Kt5) was totally predictable and that Wilson always used it, gave Poirot the insight into how he had been killed.
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